Hi There, Not sure if this is much help. I have a Kia (very similar to the Hyundai) and have managed to get access to the technical website (kiatechinfo.com) there is a similar one for Hyundai (hyundaitechinfo.com) both sites are subscription based sites. Here’s what I found that may or may not be applicable:
OBD-II port (located drivers side in the fuse box) has the following pin layout
The OBD port only provides access to the D-CAN which is diagnostics only everything else is behind the IGPM (Gateway)
on the Kia there is another connector that has all the BUS lines on it, this interface is actually located on the back of the fuse assembly
So from my very limited understanding all the other BUS lines (C-CAN, M-CAN, P-CAN, B-CAN) are behind the firewall, unless the codes are known to open the firewall you need to use the alternate location to access the BUS
I’m not sure if thats of any help to anyone.
Do you know if there’s the ability to add multiple or access multiple CANBUS through the autopi?
edit: This is on a 2018 Kia Sorrento (UMA) 2.0L